How to dismantle a Harken furler?

[Jolly Roger]

I recently bought a 1984 used Harken furler, series 1, very cheap. The lower bearings are stiff, but I figured I could dismantle the unit and refurbish it. I easily took the outer bearing off the lower swivel after removing the circlip, and was surprised to see the ball bearings appear to be nylon, or plastic or something similar.
But I’m completely baffled as to how to get at the inner bearing races. There doesn’t appear to be any retaining clips, only two little oil holes in the one piece housing.
Any advice would be appreciated.